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<div class="titlepage"><div><div><h5 class="title">
<a name="asio.reference.basic_datagram_socket.async_send_to.overload1"></a><a class="link" href="overload1.html" title="basic_datagram_socket::async_send_to (1 of 2 overloads)">basic_datagram_socket::async_send_to
          (1 of 2 overloads)</a>
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<p>
            Start an asynchronous send.
          </p>
<pre class="programlisting">template&lt;
    typename <a class="link" href="../../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
    typename <a class="link" href="../../WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
<a class="link" href="../../asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_send_to(
    const ConstBufferSequence &amp; buffers,
    const endpoint_type &amp; destination,
    WriteHandler &amp;&amp; handler);
</pre>
<p>
            This function is used to asynchronously send a datagram to the specified
            remote endpoint. The function call always returns immediately.
          </p>
<h6>
<a name="asio.reference.basic_datagram_socket.async_send_to.overload1.h0"></a>
            <span><a name="asio.reference.basic_datagram_socket.async_send_to.overload1.parameters"></a></span><a class="link" href="overload1.html#asio.reference.basic_datagram_socket.async_send_to.overload1.parameters">Parameters</a>
          </h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">buffers</span></dt>
<dd><p>
                  One or more data buffers to be sent to the remote endpoint. Although
                  the buffers object may be copied as necessary, ownership of the
                  underlying memory blocks is retained by the caller, which must
                  guarantee that they remain valid until the handler is called.
                </p></dd>
<dt><span class="term">destination</span></dt>
<dd><p>
                  The remote endpoint to which the data will be sent. Copies will
                  be made of the endpoint as required.
                </p></dd>
<dt><span class="term">handler</span></dt>
<dd>
<p>
                  The handler to be called when the send operation completes. Copies
                  will be made of the handler as required. The function signature
                  of the handler must be:
</p>
<pre class="programlisting">void handler(
  const asio::error_code&amp; error, // Result of operation.
  std::size_t bytes_transferred           // Number of bytes sent.
);
</pre>
<p>
                  Regardless of whether the asynchronous operation completes immediately
                  or not, the handler will not be invoked from within this function.
                  Invocation of the handler will be performed in a manner equivalent
                  to using <code class="computeroutput">asio::io_context::post()</code>.
                </p>
</dd>
</dl>
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<h6>
<a name="asio.reference.basic_datagram_socket.async_send_to.overload1.h1"></a>
            <span><a name="asio.reference.basic_datagram_socket.async_send_to.overload1.example"></a></span><a class="link" href="overload1.html#asio.reference.basic_datagram_socket.async_send_to.overload1.example">Example</a>
          </h6>
<p>
            To send a single data buffer use the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
            function as follows:
          </p>
<pre class="programlisting">asio::ip::udp::endpoint destination(
    asio::ip::address::from_string("1.2.3.4"), 12345);
socket.async_send_to(
    asio::buffer(data, size), destination, handler);
</pre>
<p>
            See the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
            documentation for information on sending multiple buffers in one go,
            and how to use it with arrays, boost::array or std::vector.
          </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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